So I felt compelled to measure the true weakness of our team so far this year: the rotation. Which is quite paradoxical considering everyone thought the lineup was kind of sketchy and the rotation would be very good. Well my tools were a little bit crude, but I think they give a solid estimate to the size of the damage Briefly I used some respected preseason predictions (the PECOTA 50% line) and then compared ERAs that were projected vs. actual ERAs this year for our 5 starters. Sheets, Suppan, and Vargas have as a group done just about exactly what was projected of them by PECOTA. Sheets has done a little worse and Vargas has been a little better. Bush and Capuano though have done much worse than their projections. For Bush his projected ERA was 4.22 compared to his 4.86. If you look at his projected components like HR, hits, walks, and Ks. You see he has actually out performed his K rate while his hit rate is way above what it should be with the other components in line. With Cappy his ERA was projected at 4.37 and is currently 5.16 Again his K rate is ahead of what was projected, but his walk rate is almost double! His hit rate is a little higher too. If you total up all the ERA differences and then scale for the innings pitched for the entire rotation I come up with a figure of 14.3 runs too many given up. Which gives an estimated win impact of 2 wins.